1 files changed, 86 insertions, 0 deletions
diff --git a/backends/platform/gp2x/gp2x-mem.cpp b/backends/platform/gp2x/gp2x-mem.cpp
new file mode 100644
index 0000000000..ec73922bf7
--- /dev/null
+++ b/backends/platform/gp2x/gp2x-mem.cpp
@@ -0,0 +1,86 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/*
+ * GP2X: Memory tweaking stuff.
+ *
+ */
+
+#include <stdio.h>
+#include <signal.h>
+#include <setjmp.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "gp2x-mem.h"
+
+void SetClock (unsigned c)
+{
+	unsigned v;
+	unsigned mdiv,pdiv=3,scale=0;
+
+	// Set ARM920t clock
+	c *= 1000000;
+	mdiv = (c*pdiv) / SYS_CLK_FREQ;
+    mdiv = ((mdiv-8)<<8) & 0xff00;
+	pdiv = ((pdiv-2)<<2) & 0xfc;
+    scale &= 3;
+    v = mdiv | pdiv | scale;
+    gp2x_memregs[0x910>>1] = v;
+}
+
+void patchMMU (void)
+{
+	//volatile unsigned int *secbuf = (unsigned int *)malloc (204800);
+
+	printf ("Reconfiguring cached memory regions...\n");
+
+	//hackpgtable();
+	//printf ("Sucess...\n");
+
+	system("/sbin/rmmod mmuhack");
+	system("/sbin/insmod -f mmuhack.o");
+
+	int mmufd = open("/dev/mmuhack", O_RDWR);
+
+	if(mmufd < 0)
+	{
+		printf ("Upper memory uncached (attempt failed, access to upper memory will be slower)...\n");
+	}
+	else
+	{
+		printf ("Upper memory cached...\n");
+		close(mmufd);
+	}
+}
+
+void unpatchMMU (void)
+{
+	printf ("Restoreing cached memory regions...\n");
+	system("/sbin/rmmod mmuhack");
+}